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LibJS: Allow "approximately" results to differ in plural form

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This is a normative change in the Intl.NumberFormat V3 spec. See:
08f599b

Note that this didn't seem to actually affect our implementation. The
Unicode spec states:

https://www.unicode.org/reports/tr35/tr35-53/tr35-numbers.html#Plural_Ranges
"If there is no value for a <start,end> pair, the default result is end"

Therefore, our implementation did not have the behavior noted by the
issue this normative change addressed:

    const pr = new Intl.PluralRules("en-US");
    pr.selectRange(1, 1); // Is "other", should be "one"

Our implementation already returned "one" here because there is no such
<start=one, end=one> value in the CLDR for en-US. Thus, we already
returned the end value of "one".
This commit is contained in:
Timothy Flynn 2023-01-30 12:45:16 -05:00 • committed by Tim Flynn
parent 5c1038e54f
commit e74e8381d5
6 changed files with 36 additions and 17 deletions
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30
Userland/Libraries/LibJS/Runtime/Intl/PluralRules.cpp
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@ -92,13 +92,14 @@ PluralRules::PluralRules(Object& prototype)
}
// 16.5.3 ResolvePlural ( pluralRules, n ), https://tc39.es/ecma402/#sec-resolveplural
ThrowCompletionOr<::Locale::PluralCategory> resolve_plural(VM& vm, PluralRules const& plural_rules, Value number)
// 1.5.3 ResolvePlural ( pluralRules, n ), https://tc39.es/proposal-intl-numberformat-v3/out/pluralrules/proposed.html#sec-resolveplural
ThrowCompletionOr<ResolvedPlurality> resolve_plural(VM& vm, PluralRules const& plural_rules, Value number)
{
return resolve_plural(vm, plural_rules, plural_rules.type(), number);
}
// Non-standard overload of ResolvePlural to allow using the AO without an Intl.PluralRules object.
ThrowCompletionOr<::Locale::PluralCategory> resolve_plural(VM& vm, NumberFormatBase const& number_format, ::Locale::PluralForm type, Value number)
ThrowCompletionOr<ResolvedPlurality> resolve_plural(VM& vm, NumberFormatBase const& number_format, ::Locale::PluralForm type, Value number)
{
// 1. Assert: Type(pluralRules) is Object.
// 2. Assert: pluralRules has an [[InitializedPluralRules]] internal slot.
@ -107,7 +108,7 @@ ThrowCompletionOr<::Locale::PluralCategory> resolve_plural(VM& vm, NumberFormatB
// 4. If n is not a finite Number, then
if (!number.is_finite_number()) {
// a. Return "other".
return ::Locale::PluralCategory::Other;
return ResolvedPlurality { ::Locale::PluralCategory::Other, String {} };
}
// 5. Let locale be pluralRules.[[Locale]].
@ -119,13 +120,16 @@ ThrowCompletionOr<::Locale::PluralCategory> resolve_plural(VM& vm, NumberFormatB
auto result = MUST_OR_THROW_OOM(format_numeric_to_string(vm, number_format, number));
// 8. Let s be res.[[FormattedString]].
auto const& string = result.formatted_string;
auto string = move(result.formatted_string);
// 9. Let operands be ! GetOperands(s).
auto operands = get_operands(string);
// 10. Return ! PluralRuleSelect(locale, type, n, operands).
return plural_rule_select(locale, type, number, move(operands));
// 10. Let p be ! PluralRuleSelect(locale, type, n, operands).
auto plural_category = plural_rule_select(locale, type, number, move(operands));
// 11. Return the Record { [[PluralCategory]]: p, [[FormattedString]]: s }.
return ResolvedPlurality { plural_category, move(string) };
}
// 1.5.4 PluralRuleSelectRange ( locale, type, xp, yp ), https://tc39.es/proposal-intl-numberformat-v3/out/pluralrules/proposed.html#sec-pluralruleselectrange
@ -154,14 +158,20 @@ ThrowCompletionOr<::Locale::PluralCategory> resolve_plural_range(VM& vm, PluralR
// 7. Let yp be ! ResolvePlural(pluralRules, y).
auto end_plurality = MUST_OR_THROW_OOM(resolve_plural(vm, plural_rules, end));
// 8. Let locale be pluralRules.[[Locale]].
// 8. If xp.[[FormattedString]] is yp.[[FormattedString]], then
if (start_plurality.formatted_string == end_plurality.formatted_string) {
// a. Return xp.[[PluralCategory]].
return start_plurality.plural_category;
}
// 9. Let locale be pluralRules.[[Locale]].
auto const& locale = plural_rules.locale();
// 9. Let type be pluralRules.[[Type]].
// 10. Let type be pluralRules.[[Type]].
auto type = plural_rules.type();
// 10. Return ! PluralRuleSelectRange(locale, type, xp, yp).
return plural_rule_select_range(locale, type, start_plurality, end_plurality);
// 11. Return ! PluralRuleSelectRange(locale, type, xp.[[PluralCategory]], yp.[[PluralCategory]]).
return plural_rule_select_range(locale, type, start_plurality.plural_category, end_plurality.plural_category);
}
}